SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Current bucket: app-logs-prod
Objects: compressed JSON logs, 150 GB per month
Access pattern:
Days 0-30: frequent reads for troubleshooting
Days 31-120: occasional reads
Days 121-400: rare reads, retrieval can take hours
Compliance: retain all logs for 400 days, then delete
Current storage class: S3 Standard for all objects
Monthly S3 bill trend: rising steadily as log volume grows
Based on the exhibit, the company stores application logs in Amazon S3 for 400 days. The logs are read heavily for the first 30 days, occasionally for the next 90 days, and very rarely after that. Retrieval after day 120 can take up to several hours, but the data must remain available until day 400. Which lifecycle policy is the most cost-effective fit?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Current bucket: app-logs-prod
Objects: compressed JSON logs, 150 GB per month
Access pattern:
Days 0-30: frequent reads for troubleshooting
Days 31-120: occasional reads
Days 121-400: rare reads, retrieval can take hours
Compliance: retain all logs for 400 days, then delete
Current storage class: S3 Standard for all objects
Monthly S3 bill trend: rising steadily as log volume grows
A
Keep all logs in S3 Standard for 400 days and enable requester pays to reduce the company's bill.
Why wrong: Requester Pays only shifts request costs to whoever accesses the object. It does not reduce the storage cost of retaining the logs for 400 days, and it is not appropriate when the company itself must retain and read the data for compliance and troubleshooting.
B
Transition logs to S3 Standard-IA after 30 days, then to S3 Glacier Flexible Retrieval after 120 days, and expire them at 400 days.
This follows the access pattern and the retrieval-time requirement. S3 Standard fits the heavy-read period in the first 30 days. Standard-IA is a lower-cost choice for the next 90 days when access is only occasional, and Glacier Flexible Retrieval is appropriate after day 120 because the logs are rarely read and can tolerate retrieval in hours. Expiration at day 400 satisfies the retention requirement exactly.
C
Transition logs directly from S3 Standard to S3 Glacier Deep Archive after 30 days and expire them at 400 days.
Why wrong: Deep Archive is cheaper for very cold data, but retrieval is significantly slower than the several-hour recovery window described in the exhibit. That makes it a poor fit for the period after day 120 when the logs must still be retrievable within hours.
D
Move logs to S3 Intelligent-Tiering only and disable lifecycle transitions because access is unpredictable.
Why wrong: Intelligent-Tiering is most useful when access patterns are unknown or change frequently. In this scenario, the access pattern is clearly defined, so explicit lifecycle transitions are usually cheaper than paying the monitoring overhead of Intelligent-Tiering across the entire retention period.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Transition logs to S3 Standard-IA after 30 days, then to S3 Glacier Flexible Retrieval after 120 days, and expire them at 400 days.
Option B is correct because it aligns the storage class transitions with the access patterns: S3 Standard for the first 30 days (heavy reads), S3 Standard-IA for the next 90 days (occasional reads), and S3 Glacier Flexible Retrieval for the remaining period (rare access, with retrieval up to several hours acceptable). This minimizes storage costs while ensuring data availability until day 400, where lifecycle expiration removes the objects.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Keep all logs in S3 Standard for 400 days and enable requester pays to reduce the company's bill.
Why it's wrong here
Requester Pays only shifts request costs to whoever accesses the object. It does not reduce the storage cost of retaining the logs for 400 days, and it is not appropriate when the company itself must retain and read the data for compliance and troubleshooting.
✓
Transition logs to S3 Standard-IA after 30 days, then to S3 Glacier Flexible Retrieval after 120 days, and expire them at 400 days.
Why this is correct
This follows the access pattern and the retrieval-time requirement. S3 Standard fits the heavy-read period in the first 30 days. Standard-IA is a lower-cost choice for the next 90 days when access is only occasional, and Glacier Flexible Retrieval is appropriate after day 120 because the logs are rarely read and can tolerate retrieval in hours. Expiration at day 400 satisfies the retention requirement exactly.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Transition logs directly from S3 Standard to S3 Glacier Deep Archive after 30 days and expire them at 400 days.
Why it's wrong here
Deep Archive is cheaper for very cold data, but retrieval is significantly slower than the several-hour recovery window described in the exhibit. That makes it a poor fit for the period after day 120 when the logs must still be retrievable within hours.
✗
Move logs to S3 Intelligent-Tiering only and disable lifecycle transitions because access is unpredictable.
Why it's wrong here
Intelligent-Tiering is most useful when access patterns are unknown or change frequently. In this scenario, the access pattern is clearly defined, so explicit lifecycle transitions are usually cheaper than paying the monitoring overhead of Intelligent-Tiering across the entire retention period.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option C (S3 Glacier Deep Archive) because it is the cheapest storage class, but they overlook the occasional access requirement between days 30 and 120 and the retrieval time constraints, which make S3 Glacier Flexible Retrieval the correct choice for the final tier.
Trap categories for this question
Scenario analysis trap
Intelligent-Tiering is most useful when access patterns are unknown or change frequently. In this scenario, the access pattern is clearly defined, so explicit lifecycle transitions are usually cheaper than paying the monitoring overhead of Intelligent-Tiering across the entire retention period.
Detailed technical explanation
How to think about this question
S3 Glacier Flexible Retrieval offers retrieval times from minutes to hours (typically 1–5 minutes for expedited, 3–5 hours for standard), making it suitable for the 'up to several hours' requirement after day 120. The lifecycle policy uses the 'Transition' action to move objects between storage classes, and the 'Expiration' action to permanently delete objects after 400 days, which is more cost-effective than using S3 Standard for the entire duration. Note that S3 Standard-IA has a minimum storage duration of 30 days, so transitioning after 30 days avoids early deletion fees.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Transition logs to S3 Standard-IA after 30 days, then to S3 Glacier Flexible Retrieval after 120 days, and expire them at 400 days. — Option B is correct because it aligns the storage class transitions with the access patterns: S3 Standard for the first 30 days (heavy reads), S3 Standard-IA for the next 90 days (occasional reads), and S3 Glacier Flexible Retrieval for the remaining period (rare access, with retrieval up to several hours acceptable). This minimizes storage costs while ensuring data availability until day 400, where lifecycle expiration removes the objects.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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